{"id":15301,"date":"2021-07-09T09:55:53","date_gmt":"2021-07-09T00:55:53","guid":{"rendered":"https:\/\/itport.cloud\/?p=15301"},"modified":"2021-07-09T09:55:54","modified_gmt":"2021-07-09T00:55:54","slug":"post-15301","status":"publish","type":"post","link":"https:\/\/itport.cloud\/?p=15301","title":{"rendered":"SQL\u8a00\u8a9e\u3067\u4f7f\u3048\u308b\u96c6\u7d04\u95a2\u6570\uff08PostgreSQL\u7de8\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"e79baee6aca1-1\">\u76ee\u6b21<\/h2>\n\n\n\n<p><a href=\"#topic1\">\u306f\u3058\u3081\u306b<\/a><br><a href=\"#topic2\">\u96c6\u7d04\u95a2\u6570\u3068\u306f<\/a><br><a href=\"#topic3\">\u96c6\u7d04\u95a2\u6570\u4e00\u89a7<\/a><br><a href=\"#topic5\">\u7d42\u308f\u308a<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"topic1\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p>\u6700\u8fd1\u3001\u96c6\u7d04\u95a2\u6570\u3092\u6539\u3081\u3066\u8abf\u3079\u308b\u6a5f\u4f1a\u304c\u3042\u308a\u3001\u305d\u306e\u4e2d\u3067\u77e5\u3089\u306a\u3044\u95a2\u6570\u3082\u3042\u3063\u305f\u306e\u3067\u4e00\u5ea6\u6574\u7406\u306e\u305f\u3081\u8a18\u4e8b\u306b\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<br>\u74b0\u5883\u306f\u4ee5\u4e0b\u3067\u884c\u3044\u307e\u3059\u306e\u3067\u3001\u3082\u3057\u304b\u3059\u308b\u3068\u6700\u65b0\u306ePostgreSQL\u3067\u306f\u5909\u66f4\u306b\u306a\u3063\u3066\u3044\u308b\u90e8\u5206\u3082\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u306e\u3067<br>\u305d\u306e\u5834\u5408\u306f\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u3093\u3067\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<br><br>\u74b0\u5883<br>Windows10<br>PostgreSQL 9.5<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"topic2\"> \u96c6\u7d04\u95a2\u6570\u3068\u306f<\/h2>\n\n\n\n<p>\u96c6\u7d04\u95a2\u6570\u3068\u306fSQL\u306e\u4e2d\u3067\u4f7f\u7528\u3067\u304d\u308b\u95a2\u6570\u306e\u4e00\u3064\u3067\u3001\u300c\u6307\u5b9a\u3057\u305f\u5217\u306b\u5bfe\u3057\u3066\u3001\u95a2\u9023\u3059\u308b\u5168\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3067\u4f55\u3089\u304b\u306e\u51e6\u7406\u3092\u884c\u3044\u30011\u3064\u306e\u5024\u3092\u51fa\u3059\u300d\u3068\u3044\u3046\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<br>\u3067\u306f\u5b9f\u969b\u306b\u96c6\u7d04\u95a2\u6570\u3092\u4f7f\u3063\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br><br>\u307e\u305a\u4ee5\u4e0b\u306e\u7d66\u6599\u30c6\u30fc\u30d6\u30eb\u300cuser_salary\u300d\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<br>salary\u5217\u304c\u7d66\u6599\u3067\u3001length_of_service\u5217\u304c\u52e4\u7d9a\u5e74\u6570\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-28_11h13_57.png\" alt=\"\" class=\"wp-image-15303\" width=\"478\" height=\"309\" srcset=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-28_11h13_57.png 319w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-28_11h13_57-300x194.png 300w\" sizes=\"auto, (max-width: 478px) 100vw, 478px\" \/><figcaption> <br>\u300cuser_salary\u300d\u30c6\u30fc\u30d6\u30eb <\/figcaption><\/figure><\/div>\n\n\n\n<p>\u3053\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u4e00\u756a\u9ad8\u3044\u7d66\u6599\u306f\u300c500,000\u300d\u306a\u306e\u306f\u898b\u3066\u5206\u304b\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u96c6\u7d04\u95a2\u6570\u3092\u4f7f\u3063\u3066SQL\u3067\u4e00\u756a\u9ad8\u3044\u7d66\u6599\u984d\u3092\u53d6\u5f97\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<br>\u3053\u3053\u3067\u4f7f\u7528\u3059\u308b\u96c6\u7d04\u95a2\u6570\u306fMax\u306b\u306a\u308a\u307e\u3059\u3002<br><br>\u3067\u306f\u5b9f\u969b\u306eSQL\u304c\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<br><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT Max(salary) FROM user_salary\n<\/pre><\/div>\n\n\n<p>\u7d50\u679c\u306f\u3053\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_08h57_59-e1625012258127.png\" alt=\"\" class=\"wp-image-15317\" width=\"693\" height=\"496\"\/><\/figure><\/div>\n\n\n\n<p>Max\u95a2\u6570\u306f\u300cMax(\u5217\u540d)\u300d\u3068\u3044\u3046\u4f7f\u3044\u65b9\u3092\u3057\u3001\u62ec\u5f27\u306e\u4e2d\u3067\u6307\u5b9a\u3057\u305f\u5217\u306e\u5024\u3067\u4e00\u756a\u5927\u304d\u306a\u5024\u3092\u6301\u3063\u3066\u304d\u307e\u3059\u3002<br>Min\u95a2\u6570\u3068\u3044\u3046\u306e\u3082\u3042\u308a\u3001\u4f7f\u3044\u65b9\u306fMax\u3068\u540c\u3058\u3067\u3001\u6307\u5b9a\u3057\u305f\u5217\u306e\u5024\u3067\u4e00\u756a\u5c0f\u3055\u306a\u5024\u3092\u6301\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3082\u3046\u4e00\u3064\u4f8b\u3068\u3057\u3066\u3001Count\u95a2\u6570\u3092\u4f7f\u3063\u3066\u307f\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<br>Count\u95a2\u6570\u306f\u540d\u524d\u306e\u901a\u308a\u6570\u3092\u6570\u3048\u308b\u95a2\u6570\u3067\u3001\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u6570\u3048\u308b\u3068\u304d\u306b\u3088\u304f\u4f7f\u3044\u307e\u3059\u3002<br>\u305f\u3060\u4ed6\u306e\u96c6\u7d04\u95a2\u6570\u3068\u306f\u4f8b\u5916\u3067\u5217\u540d\u3092\u6307\u5b9a\u3059\u308b\u4ee3\u308f\u308a\u306b\u300c*\u300d\u3092\u4f7f\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br>\u5b9f\u969b\u306b\u3084\u3063\u3066\u307f\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_08h59_45-e1625012339476.png\" alt=\"\" class=\"wp-image-15319\" width=\"571\" height=\"462\"\/><\/figure><\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u3068\u300cuser_salary\u300d\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u6570\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\uff18\u3064\u304f\u3089\u3044\u306a\u3089\u6570\u3048\u308b\u4e8b\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u30ec\u30b3\u30fc\u30c9\u6570\u304c\u591a\u304f\u306a\u308b\u3068\u6570\u3048\u9593\u9055\u3044\u3082\u767a\u751f\u3059\u308b\u306e\u3067\u305d\u3046\u3044\u3063\u305f\u3068\u304d\u306b\u4f7f\u7528\u3059\u308b\u306e\u304c\u3088\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"topic3\">\u96c6\u7d04\u95a2\u6570\u4e00\u89a7<\/h2>\n\n\n\n<p>\u96c6\u7d04\u95a2\u6570\u306f\u4e0a\u8a18\u3067\u4e0a\u3052\u305f\u3082\u306e\u306e\u4ed6\u306b\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u8272\u3005\u3042\u308b\u306e\u3067\u3068\u308a\u3042\u3048\u305a\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u4e00\u89a7\u3092\u5f15\u7528\u3057\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-1024x459.png\" alt=\"\" class=\"wp-image-15321\" width=\"1536\" height=\"688\" srcset=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-1024x459.png 1024w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-300x134.png 300w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-768x344.png 768w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-450x202.png 450w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49-900x403.png 900w, https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h10_49.png 1708w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><figcaption>PostgreSQL 9.5.4\u6587\u66f8\u3000 9.20. \u96c6\u7d04\u95a2\u6570 <\/figcaption><\/figure><\/div>\n\n\n\n<p>\u3053\u3046\u3084\u3063\u3066\u307f\u308b\u3068\u610f\u5916\u3068\u3042\u308b\u3093\u3060\u306a\u3068\u611f\u3058\u307e\u3059\u3002<br>\u3061\u306a\u307f\u306b\u7d71\u8a08\u51e6\u7406\u7528\u306e\u96c6\u7d04\u95a2\u6570\u3082\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u3054\u8208\u5473\u306e\u3042\u308b\u65b9\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306eURL\u304b\u3089\u3054\u78ba\u8a8d\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<br><a href=\"https:\/\/www.postgresql.jp\/document\/9.5\/html\/functions-aggregate.html\">https:\/\/www.postgresql.jp\/document\/9.5\/html\/functions-aggregate.html<\/a><\/p>\n\n\n\n<p>\u3053\u306e\u4e2d\u3067\u500b\u4eba\u7684\u306b\u306f\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u3048\u305d\u3046\u306a\u3082\u306e\u304c\u3042\u3063\u305f\u306e\u3067\u3001\u6700\u5f8c\u306b\u305d\u308c\u3092\u30d4\u30c3\u30af\u30a2\u30c3\u30d7\u3057\u3066\u4eca\u56de\u306e\u8a18\u4e8b\u306f\u7d42\u308f\u308d\u3046\u3068\u601d\u3044\u307e\u3059\u3002<br><br>\u305d\u306e\u96c6\u7d04\u95a2\u6570\u306fString_Agg\u95a2\u6570\u3068\u8a00\u3046\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<br>\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001\u6307\u5b9a\u3057\u305f\u5217\u306e\u5024\u3092\u5168\u3066\u6587\u5b57\u5217\u9023\u7d50\u3092\u3057\u3066\u304f\u308c\u308b\u3068\u3044\u3046\u4fbf\u5229\u306a\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<br>\u65e9\u901f\u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/itport.cloud\/wp-content\/uploads\/2021\/06\/2021-06-30_09h08_50-e1625012397371.png\" alt=\"\" class=\"wp-image-15320\" width=\"675\" height=\"424\"\/><\/figure><\/div>\n\n\n\n<p>String_Agg\u95a2\u6570\u306f\u96c6\u7d04\u95a2\u6570\u306e\u4e2d\u3067\u306f\u73cd\u3057\u304f\uff12\u3064\u306e\u5f15\u6570\u3068\u53d6\u308a\u307e\u3059\u3002<br>\uff11\u3064\u76ee\u306f\u4ed6\u306e\u96c6\u7d04\u95a2\u6570\u3068\u540c\u69d8\u306b\u5217\u540d\u3092\u3001\uff12\u3064\u76ee\u306f\u533a\u5207\u308a\u6587\u5b57\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<br>\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u6307\u5b9a\u3057\u305f\u5217\u306e\u5024\u3092\u5168\u3066\u533a\u5207\u308a\u6587\u5b57\u3092\u4f7f\u3063\u3066\u6587\u5b57\u5217\u9023\u7d50\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306e\u4f55\u304c\u4fbf\u5229\u304b\u3068\u3044\u3044\u307e\u3059\u3068\u3001\u308f\u3056\u308f\u3056\u30b3\u30fc\u30c9\u5074\u3067\u53d6\u5f97\u3057\u305f\u7d50\u679c\u3092\u30eb\u30fc\u30d7\u3057\u3066\u6587\u5b57\u5217\u9023\u7d50\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308b\u70b9\u3067\u3059\u3002<br>\u65b0\u3057\u3044\u30b7\u30b9\u30c6\u30e0\u3060\u3068DB\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u3042\u3063\u3066\u3001\u305d\u3082\u305d\u3082SQL\u3092\u66f8\u304b\u306a\u3044\u3053\u3068\u3082\u5897\u3048\u3066\u304d\u307e\u3057\u305f\u304c\u3001<br>\u307e\u3060\u307e\u3060\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u306fSQL\u3092\u66f8\u3044\u3066\u3044\u308b\u90e8\u5206\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u305d\u306e\u4e2d\u3067DB\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u5217\u3092\u9023\u7d50\u3057\u305f\u3044\u5834\u5408\u306b\u3001\u30b3\u30fc\u30c9\u5074\u3067\u66f8\u304f\u3068\u7d50\u69cb\u51e6\u7406\u304c\u9045\u304b\u3063\u305f\u308a\u3057\u307e\u3059\u3002<br>\u305d\u306e\u3068\u304d\u306bString_Agg\u95a2\u6570\u3092\u4f7f\u3046\u3068\u7d50\u69cb\u51e6\u7406\u901f\u5ea6\u304c\u6539\u5584\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308b\u306e\u3067\u3001\u982d\u306e\u7247\u9685\u306b\u7f6e\u3044\u3066\u3082\u3089\u3048\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" 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